Arm mounting for tool operating motors



Feb. 10, 1953 A. c. JOHNSON 2,627,830

' ARM MOUNTING FOR TOOL. OPERATING MOTORS Filed May 19, 1950 sSheets-Shegt 1- IN VEN TOR. Arzfidr 6' Jab/veal? Ilia/97?] Feb. 10, 1953A. c. JOHNSON ARM MOUNTING FOR TOOL OPERATING MOTORS 3 Sheets-Sheet 2Filed May 19, 1950 IN V EN TOR. flrf/rar C .fofinsan Y Afforny Feb. 10,1953 A. c. JOHNSON ARM MOUNTING FOR TOOL OPERATING MOTORS 3 Sheets-Sheet5 Filed May 19, 1950 INVENTOR. A r/fiur (7 JZrAnSan Patented Feb. 10,1953 UNITED STATES PATENT OFFICE ARM MOUNTING FOR TOOL OPERATING MOTORS1 Claim.

This invention hasto do with an arm mounting and is particularlyconcerned with a. structure for supporting or mounting the arm of amachine such, for example, as a wood working machine of the general typewherein an arm is supported to reciprocate, usually in a horizontalplane, and serves to carry a motor which operates a saw or other tool. Ageneral object of the present invention is to provide a mounting whichis simple, efiective, and practical in construction and which serves tosupport an arm so that it is adjustable to various positions in ahorizontal plane and can operate or reciprocate freely.

A general object of the present invention is to provide an arm mountinginvolving a post carried by a simple, inexpensive mechanism serving toadjust the post relative to the guide.

A further object of the invention is to provide an arm mounting of thegeneral character referred to in which a simple, practical, inexpensivemounting means is provided in the head on the post to support the arm sothat it reciprocates freely.

It is another object of the invention to provide a mechanism of thegeneral character referred to in which various stop means and lock meansare provided for controlling the working parts, all of which means areof simple construction and so constructed and located that they aresimple and convenient to operate.

The mechanism embodying the present invention has a vertically disposedguide with a body portion that projects upwardly from a base.

The body portion of the guide has a vertical bore 7 that carries atubular post so that the post can reciprocate, and rotate. A releasablestop means serves to hold the post in a predetermined rotative positionin the guide while allowing it to reciprocate therein. A lock means isprovided for setting or locking the post against movement relative tothe guide when in any position .relative thereto.

A head on the upper end of the post involves a box-like body withvertical sides, a bottom and a top. The bottom has a depending collarportion that receives the upper end of the post and provides the meansof connection between the post and the head. The top is formed separatefrom the other parts and is releasably secured in position by suitablefasteners. Opposite sides of the head or body have openings that passthe arm which is supported by the head. In accordance with the inventionthe arm is a fabricated structure involving two spaced parallel bars andthese pass through suitable openings in the sides of the body. Wipersare carried by the sides of the body and engage around the rods.

Arm mountings in the head involve sets of rollers or anti-frictiondevices located in the body and engaging the rods of the arm. Where thearm involves two rods there are sets of rollers engaging each of therods. In such case the sets of rollers engaging one of the rods eachinvolves three rollers spaced around the rod and one of these isadjustable to establish the desired fit between the rod and the rollers.The set of rollers engaging the other rod involves but two rollers, forinstance, upper and lower rollers, and these are adjustable to gain thedesired fit with the rod and to suitably locate the rod in the head.

The arm construction is unique in that it involves two spaced parallelrods which may be plain, turned rods of like size. The rear end portionsof the rods are joined by a transverse connector or web while theforward end portions are joined by a mounting which carries the tooldriving motor, as for instance, through a suitable bracket or the like.A lock means is provided for setting the arm against movement relativeto the head and this means preferably includes a clamp shoe in the bodyoperated by a screw having threaded engagement with the top of the body.A suitable operating means serves to adjust the post vertically relativeto its supporting guide and this means preferably involves a screwcarried by the top of the body so that it can be rotated by a hand wheelmounted on the screw above the top. The screw depends cen trally throughthe post and has threaded engagement with a sleeve fixed to the baseportion that carries the guide and extends upwardly into the lower endportion of the post.

The various objects and features of my invention will be fullyunderstood from the followin detailed description of a typical preferredform and application of the invention, throughout which descriptionreference is made to the accompanying drawings, in which:

Fig. 1 is a side elevation of a typical construction embodying thepresent invention showing it incorporated in a machine where the armcarries a motor which operates a saw. Fig. -2 is a plan view of thestructure shown in Fig. 1, being a view taken as indicated by line 22 onFig. 1. Fig. 3 is an enlarged sectional view taken as indicated by line3-3 on Fig. '1. Fig. 4 is an enlarged vertical sectional view takensubstantially as indicated by line 4-4 on Fig. 2. Fig, 5 is an enlargedplan section taken as indicated by line 5-5 on Fig. 1. Fig. 6 is adetailed sectional view taken as indicated by line 66 on Fig. 4. Fig. 7is a plan view taken substantially as indicated by line 7-1 on Fig. 4.Fig. 8 is an enlarged view of a portion of the structure shown in Fig.6, being a view taken as indicated by line 88 on Fig. 6. Fig. 9 is anenlarged detailed sectional view taken as indicated by line 9-9 on Fig.4. Fig. 10 is a detailed sectional view taken as indicated by line l0l0on Fig. l, and Fig. 11 is an enlarged detailed sectional View taken asin cheated by line ll-il on Fig. 5.

The mechanism provided by the present inven- 7 tion can be employed invarious machines. However, it is particularly practical as applied towood working machines of the type wherein a horizontally disposedreciprocating arm carries a motor driven tool such as a saw. For purposeof example the invention will be described as apfreely and lock means Fserves to set or lock the post against movement in any desired positionrelative to the guide. I

A head G is provided on the upper end of post D and carriesmounting-means H (Figs. 4, 6, 7 and 9) supporting an arm J forreciprocation. Lock means K is provided for setting the arm againstmovement relative to the head and operating means L is provided foroperating the post vertically relative to the guide 0. The armpreferably involves spaced parallel rods l0 joined at their forward endby a motor mounting l2 shown as involving an adjustable bracket I3 thatdepends from the arm and carries the motor M which operates a suitabletool T. The motor and its mounting are more fully described and are thesubject of copending application entitled Wood Working Machine withMotor Driven Tool and Shift-able Work Carrier, Serial No. 162,945, filedon even date herewith, now abandoned.

The base A is shown as a simple rigid horizontally disposed elementsuitable for mounting on a stand or bench and the particular workcarrier or support B is shown as an elongate fiattopped element fixed onthe forward portion of the base and provided at its rear edge with aguide or stop 20.

The guide C, as provided by the present invention, is a verticallydisposed element projecting upwardly from the base A, preferably fromthe rear edge portion thereof. The guide C is shown as an integralextension or continuation of the base and is characterized by a verticalbore 2! (Fig. 4) that receives the post D.

The post D as provided by the present invention is a simple, elongate,tubular member, the exterior 23 of which is turned so that it is roundand fits the bore 2| so the post can turn and also reciprocate relativeto the guide C.

The stop means E is a releasable device serving to locate the post D ina predetermined rotative position in the guide while allowing the post11) on the side of the guide to cooperatively engage a longitudinal slotor guideway 26 in the side of the post. A spring 21 normally yieldinglyurges the pin inwardly to engage the guide and a head 28 is provided onthe outer end of the pin to facilitate its operation. A lug 29 projectsfrom one side of the pin and is engageable over a shoulder 36 so thatthe pin can be held in a retracted position when it is desired that themeans E be held released so that it is not effective to control actionof the post. The means E is illustrated in Figs. 5 and 11 of thedrawings.

Y against movement relative to the guide.

to reciprocate freely while in that position. The

means E as shown in Fig. 5 may involve a stop Pin slidably was: gr s n;2. File-.

' The lock means F serves to set or lock the post In the particular caseillustrated the upper end portion of the guide is provided with a slitor opening 3!! and lugs 3| project outwardly from the guide at eitherside of the opening. A clamp screw 32 is carried by one of the lugs andextends through the other. A clamp nut 33 is threaded on the screw 32 toengage said other lug. The nut has an operating handle 34 so that it canbe conveniently operated and when tightened'against said other lug iteiiects clamping of the guide onto the post. The details of this meansare illustrated in Fig. 5 of the drawings.

The head G is provided on or carried by the post, preferably at theupper end thereof, and in accordance with the present invention the headis characterized by a box-like body having vertical sides 68, a bottom Mand a top 42, see Fig. Fl. A suitable means 43 mounts the box-like bodyon the upper end of the post-and in the form of the inventionillustrated this means involves a depending collar-like element 44 onthe bottom 4| of the body, which element has a .bore 45 receiving theupper end portion of the post. Suitable lock means or set screws 45 maybe provided to set the post in the collar.

The sides 40 of the box-like body are fiat vertically disposed elementsand there are four sides 40 making the body rectangular in planconfiguration. The top 42 of the body is removable from the other partsand is normally releasably held in place closing the, body by means ofreleasable fasteners 50.

The arm J, in accordance with the preferred form of the invention,involves two spaced like bars or rodsl0. Therods are coupled or joinedtogether at their ends and are otherwise free of each other and extendparallel with each other and through the body of the head G. Thecoupling or connector I l joining the rear ends of the rods l0 hasspaced openings or bores 53 (Fig. 3) receiving the ends of the rods andsuitable set screws 54 set or look the rods in the bores 53. At theforward end of the arm the mounting 12 provided to carry the motor Mserves to connect or couple the rods. 'In the particular caseillustrated the mounting i2 involves a block 55 which is fixed to therods and is, in effect,.a part of the arm, while an L-shaped bracket 13is joined to th block 55 and depends therefrom to carry the motor M. Theblock 55 is shown in Fig. 10 as provided with bores 56 that receive theforward end portions of the rods and set screws 51 lock the rods in thebores 56. "A suitable center pin 58 couples the bracket I3 with theblock 55 and a suitable mounting means 59 mounts the motor M on 2.depending portion of the bracket l3.

In accordance with the present invention opposite walls 40 of the bodyforming the head G have openings or apertures 60 (Fig. 4) that passtherods It withclearance. j 'Wherethe arm involves two sp c d parallel.ro s .121s herelnabove 5 described, each aperture wall has two suitablyspaced apertures 60. j

The mounting means H provided to support the arm J in or from the head Gsupports the arm so that it extends horizontally or normal to the postand so that it is free to slide or reciprocate. Where the arm is made upof spaced parallel rods 10, as hereinabove described, the means Hpreferably involves sets X of rollers engaging one rod and a set Y ofrollers engaging the other rod. In the case illustrated there are twosets X of rollers engaging one rod and one set Y of rollers engaging theother rod.

The sets X of rollers are located within the box-like body of head G andeach involves a single central top roller I and two angularly relatedbottom rollers H, see Figs. 6 and 9. A roller mounting i 2 elongate inform is mounted on the bottom 41 of the box-like body, as by means offasteners 18. Roller carrying spindles 74 project upwardly and outwardlyat opposite sides of the mountin I2 and carry the lower rollers H.Through this element which is clearly illustrated in Fig. 6 of thedrawings the rollers H cooperate to receive the rod 19 so that it isheld against lateral displacement as well as being supported at thedesired elevation. The top roller it! engages the top or uppermost partof the rod and retains the rod in engagement with the lower rollers H.In the particular case illustrated the lower rollers H which are spacedapart somewhat around the lower portion of the rod are supported by themounting i2 and the spindles 14 thereon so that these rollers are infixed position. The upper roller it, however, is mounted so that it isadjustable or can be varied in position. In the preferred form of theinvention the upper or top roller I0 is carried on a spindle 75projecting from a shank "1G rotatably supported in a bore H in the bodyof the head. The spindle i5 is eccentric to the shank it so that byrotating the shank in the bore ii the relationship of roller is to thebottom rollers I! can be varied. When the top roller has been suitablyadjusted it can be fixed or set in position by a set screw 13 whichengages the shank F6. The details of this mechanism are illustrated inFig. 9 of the drawings.

There is one set of rollers Y engaging the other or second rod of thearm and involves but two rollers, namely a, top roller 86 and bottomroller 8 I, see Figs. 6 and 8. The rollers 80 and Bi engage the upperand lower portions of the second rod, it being unnecessary for theserollers to do other than to hold the rod against movement vertically inthat the rollers first described serve to hold the arm in positionlaterally. In accordance with the present invention the rollers 80 and8! are both subject to adjustment vertically so that the arm can be setaccurately. In the case illustrated rollers 86 and 8| are shown carriedon spindles 83 projecting from shanks 84 carried in bores 85 where theyare set by screws 86 after the desired adjustment has been made.

With the mechanism above described the arm J which is an elongat elementis effectively supported so that it cannot turn or rotate about itslongitudinal axis but is free to slide or reciprocate longitudinally.With the construction that I have provided the desired mounting andaction is gained without providing keyways, fiat sides, or other suchfeatures on any parts of the arm, but rather, I am able to employ simplestraight plain round rods as the principal parts of the arm and byemploying two rods of nominal weight and size I provide an arm whichis-strong and rigid and at the same time light and inexpensive.

The lock means K provided for locking the arm against movement relativeto the head G is shown as involving a lock shoe 9!) located in the bodyto extend between and bear on the rods of the arm, see Figs. 4 and 7.The shoe is carried by a stem 9| loosely linked to one side M) of thebody. -A clamp s'crew 92 is threaded to the top 42 of the body andengages the shoe 310. An operating arm 92 on the screw 92 above the top42 provides a means whereby the screw can be conveniently operated. Whenthe screw 92 is operated so that it is elevated the shoe B0 merely restsfreely on the rods of the arm, but when the screw is moved downwardly itpresses the shoe tight against the rods and thus locks them againstmovement.

The operating means L provides for convenient operation or adjustment ofthe post D vertically. In accordance with the present invention themeans L involves a feed screw 95 carried by the top 42 of the box-likebody of head G to depend therefrom between the two rods I0 through anopening 96 in the bottom 4| and down through the post D to the lower endthereof. The screw 95 has a reduced stem 91 at its upper end rotatablycarried in a central bore 98 in the top 42 and the hub 99 of a handwheel I00 is set on the upper end of the stem 91 by a set screw I0 I.This provides a. suitable rotatable coupling between the screw 95 andthe top 42 and provides a convenient operating handle above the top 42and centrally of the structure. A sleeve I02 is fixed to the base as byfasteners I03 and extends upwardly around the lower end portion of thescrew 95. The upper end of the sleeve I02 has threaded engagement withthe screw so that when the screw is rotated the unit formed by the headG and post D operates vertically relative to the guide C.

In accordance with the present invention suitable sealing and wipingmeans is provided on each side of the box-like body that passes the rodsH). In the construction illustrated a holder I I0 is provided on theexterior of each apertured side 40 and the holder carries a pad HI ofsuitable material such as felt, or packing, so that the rods 10 aresurrounded where they pass into and out of the head. A suitablelubricant feed H2 maylbe provided for supplying lubricant to the pad IHaving described only a typical preferred form and application of myinvention, I do not wish to be limited or restricted to the specificdetails herein set forth, but wish to reserve to myself any variationsor modifications that may appear to those skilled in the art and fallwithin the scope of the following claim.

Having described my invention, I claim:

A post head carrying an arm and including, a box-shaped body havingapertured vertical side walls passing the arm, a bottom integral withthe walls, and a detachable top, a post-receiving collar integral withand depending from the bottom, a plurality of sets of rollers supportedin the body and carrying the arm for reciprocation, and a lock for thearm including a lock shoe in the body carried by one of the walls andengaging the arm and an operating screw threaded to the top of the bodyand operating the shoe.

ARTHUR C. JOHNSON.

(References on following page) 7 REFERENCES ormn Number The followingreferences are of record in the 3% file of this patent: iggg' gg UNITEDSTATES PATENTS 5 Number Name Date 2,367,461 Re. 17,329 Schmidt June 18,1929 1,544,456 Hutchinson June 30, 1925 1,735,990 Belnap Nov. 19, 1929Number 1,748,446 Gatzsch Feb. 25, 1930 10 274,236

Name Date Hedgpeth Apr. 29, 1930 Rueger Mar. 22, 1932 Hawley July 12,1932 Atwood May 20, 1941 Emmons Jan. 16, 1945 FOREIGN PATENTS CountryDate Great Britain July 21, 1927

